Container for dispensing preservative-free preparations
US5074440A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 1990 |
| Grant date | Dec 24, 1991 |
| Priority date | — |
| Expiry date | Jul 16, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61J1/1468
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A multiple use container for dispensing fluids, particularly preservative free preparations in variable doses, includes a squeezable container for holding the fluid. A dispenser assembly associated with an exit opening from the container includes a hollow dispensing tip which encloses a fluid valve. The fluid valve utilizes a piston head which sealingly seats in a valve seat. A resilient biasing means holds the piston head in a normally sealed or closed position. A second opening in communication with the interior of the bottle is covered by a hydrophobic filter having a pore size that prevents microbial contaminants from entering the container but prohibits fluid from leaving the container. The bottle is squeezed to force fluid to overcome the biasing pressure of the fluid valve to dispense fluid from the bottle. Upon release of that pressure, the fluid valve closes and air passes through the filter to replace the dispensed fluid. The air entering the container is sterilized by the filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.